// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_FILE_REF_HOST_H_
#define CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_FILE_REF_HOST_H_

#include <stdint.h>

#include <string>

#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "content/public/browser/browser_ppapi_host.h"
#include "ppapi/c/pp_file_info.h"
#include "ppapi/c/pp_instance.h"
#include "ppapi/c/pp_resource.h"
#include "ppapi/c/pp_time.h"
#include "ppapi/host/host_message_context.h"
#include "ppapi/host/resource_host.h"
#include "storage/browser/fileapi/file_system_url.h"

namespace content {
class PepperFileRefHost;
class PepperFileSystemBrowserHost;

// Internal and external filesystems have very different codepaths for
// performing FileRef operations. The logic is split into separate classes
// to make it easier to read.
class PepperFileRefBackend {
public:
    virtual ~PepperFileRefBackend();

    virtual int32_t MakeDirectory(ppapi::host::ReplyMessageContext context,
        int32_t make_directory_flags)
        = 0;
    virtual int32_t Touch(ppapi::host::ReplyMessageContext context,
        PP_Time last_accessed_time,
        PP_Time last_modified_time)
        = 0;
    virtual int32_t Delete(ppapi::host::ReplyMessageContext context) = 0;
    virtual int32_t Rename(ppapi::host::ReplyMessageContext context,
        PepperFileRefHost* new_file_ref)
        = 0;
    virtual int32_t Query(ppapi::host::ReplyMessageContext context) = 0;
    virtual int32_t ReadDirectoryEntries(
        ppapi::host::ReplyMessageContext context)
        = 0;
    virtual int32_t GetAbsolutePath(ppapi::host::ReplyMessageContext context) = 0;
    virtual storage::FileSystemURL GetFileSystemURL() const = 0;
    virtual base::FilePath GetExternalFilePath() const = 0;

    // Returns an error from the pp_errors.h enum.
    virtual int32_t CanRead() const = 0;
    virtual int32_t CanWrite() const = 0;
    virtual int32_t CanCreate() const = 0;
    virtual int32_t CanReadWrite() const = 0;
};

class CONTENT_EXPORT PepperFileRefHost
    : public ppapi::host::ResourceHost,
      public base::SupportsWeakPtr<PepperFileRefHost> {
public:
    PepperFileRefHost(BrowserPpapiHost* host,
        PP_Instance instance,
        PP_Resource resource,
        PP_Resource file_system,
        const std::string& internal_path);

    PepperFileRefHost(BrowserPpapiHost* host,
        PP_Instance instance,
        PP_Resource resource,
        const base::FilePath& external_path);

    ~PepperFileRefHost() override;

    // ResourceHost overrides.
    int32_t OnResourceMessageReceived(
        const IPC::Message& msg,
        ppapi::host::HostMessageContext* context) override;
    bool IsFileRefHost() override;

    // Required to support Rename().
    PP_FileSystemType GetFileSystemType() const;
    storage::FileSystemURL GetFileSystemURL() const;

    // Required to support FileIO.
    base::FilePath GetExternalFilePath() const;
    base::WeakPtr<PepperFileSystemBrowserHost> GetFileSystemHost() const;

    int32_t CanRead() const;
    int32_t CanWrite() const;
    int32_t CanCreate() const;
    int32_t CanReadWrite() const;

private:
    int32_t OnMakeDirectory(ppapi::host::HostMessageContext* context,
        int32_t make_directory_flags);
    int32_t OnTouch(ppapi::host::HostMessageContext* context,
        PP_Time last_access_time,
        PP_Time last_modified_time);
    int32_t OnDelete(ppapi::host::HostMessageContext* context);
    int32_t OnRename(ppapi::host::HostMessageContext* context,
        PP_Resource new_file_ref);
    int32_t OnQuery(ppapi::host::HostMessageContext* context);
    int32_t OnReadDirectoryEntries(ppapi::host::HostMessageContext* context);
    int32_t OnGetAbsolutePath(ppapi::host::HostMessageContext* context);

    BrowserPpapiHost* host_;
    std::unique_ptr<PepperFileRefBackend> backend_;
    base::WeakPtr<PepperFileSystemBrowserHost> file_system_host_;
    PP_FileSystemType fs_type_;

    DISALLOW_COPY_AND_ASSIGN(PepperFileRefHost);
};

} // namespace content

#endif // CONTENT_BROWSER_RENDERER_HOST_PEPPER_PEPPER_FILE_REF_HOST_H_
